ok so i recently did the exhaust on on max. I got obx headers new regular universal catalytic converter and a eBay exhaust. The problem is there is no bung fitting on the universal cat. Anyone know what size bung i need to buy. I Bought one but its way too big the o2 sensor i have is really small.

 

M12-1.25

The one you bought was probably the M18-1.5 (usually found in the intermediate pipe and in the y-pipe)

 

thank you i found one for $1.75. Hey i have another question do i need all my o2 sensors i just have the one after the cat